Abstract
The process of radiometric calibration would be coupled with the polarization properties of an optical system for spectropolarimetry, which would have significant influences on reconstructed Stokes parameters. In this paper, we propose a novel polarization radiometric calibration model that decouples the radiometric calibration coefficient and polarization properties of an optical system. The alignment errors of the polarization module and the variation of the retardations at different fields of view are considered and calibrated independently. According to these calibration results, the input Stokes parameters at different fields of view can be reconstructed accurately through the proposed model. Simulations are performed for the presented calibration and reconstruction methods, which indicate that the measurement accuracy of polarization information is improved compared with the traditional undecoupled calibration method.
Highlights
IntroductionImaging spectrometer and imaging polarimeter are of particular importance in many fields, including atmospheric aerosol characterization [1,2], remote sensing [3,4,5,6], and material characterization [7,8]
Imaging spectrometer and imaging polarimeter are of particular importance in many fields, including atmospheric aerosol characterization [1,2], remote sensing [3,4,5,6], and material characterization [7,8].These fields require an imaging spectropolarimeter to simultaneously measure the spatial, spectral, and polarization information of a scene
The channeled spectropolarimetry technique with the dispersive imaging spectrometer, which is called the channeled dispersive imaging spectropolarimeter (CDISP), has a simple structure and is easier to implement in terms of technology
Summary
Imaging spectrometer and imaging polarimeter are of particular importance in many fields, including atmospheric aerosol characterization [1,2], remote sensing [3,4,5,6], and material characterization [7,8]. Bin Yang et al presented a method of polarimetric calibration and reconstruction for the fieldable CDISP [16] This method took into account the polarization properties of the optical system, but only if it can accurately measure the spectral radiance of the detected object. We use a fieldable CDISP designed for remote sensing as an example to analyze the influence of polarization properties of the optical system on radiometric calibration of the imaging spectropolarimeter. Considering simultaneously alignment errors of the polarimetric spectral intensity modulation (PSIM) module and variation of the retardations at different fields of view, we establish a polarization radiometric calibration model for the fieldable CDISP. According to modularity theory and the principle of classical radiometric calibration, we derive a theoretical model for the polarization radiometric calibration
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